Sentences with phrase «statistical studies which»

Not exact matches

If you read conversion optimization case studies regularly (which you should), you'll often come across an example like this: The variation with increased downloads by 85 % with 97 % statistical confidence.

The study correlated a range of relevant social and personal variables, utilized a variety of research methodologies and statistical tests, and brought forward a series of conclusions and proposals which will be referred to throughout this section.

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An article on the environmental impact of the production and disposal of millions of plastic and cloth diapers reveals the length to which corporations will go to ensure profit margins: couching advertisements in «scientific studies»; funding studies based on controversial methodologies; using unscientific statistical studies to cook the books on cost - benefit analyses of environmental damage; and employing shrewd, manipulative and effective public - relations strategies.

The study uses four statistical approaches, which come to the same conclusion: «there is no significant correlation between dissolved methane concentrations in groundwater and proximity to nearby oil / gas wells.»

This doesn't directly answer your question, which is about studies and statistical correlations, but here is some evidence that at least some of the views of the Republican Party, which a lot of Republican voters hold as well, can be traced back to positions adopted by the GOP as part of the Southern Strategy to appeal to Southern whites using coded racial appeals.

Ball's testimony was based on a statistical study, which he had carried out in collaboration with other statisticians and SHRP staff.

If they include women, they must increase the sample size to achieve the same statistical power, which in turn increases the cost of the studies.

A group from the NIH's National Institute of Allergy and Infectious Diseases (NIAID) evaluated the live imaging system as a potential alternative to traditional methods of assessing investigative influenza vaccines and treatment in mice, which can be time consuming and require more study animals for valid statistical comparison.

Critics have pounced on the study, which they say has serious statistical and other problems.

«This is the first really solid statistical study I've seen which shows principles about language decline that we've know about, but hadn't been able to put together in a sound way,» says Leanne Hinton, a linguist at the University of California, Berkeley.

The causes of such unpredictable results, Harris said, can include bad ingredients in the lab, including contaminated and misidentified cell lines; poor research design, including insufficient numbers of mice in animal studies; statistical error and overreach, including «HARKing» (hypothesizing after the results are known), a push beyond the limits of the data; and funding pressures, which can lead scientists to hype or exaggerate their results to remain competitive for additional grant money.

By using a statistical technique known as Bayesian analysis — which combines probability with archaeological information to improve precision for groups of radiocarbon dates — the study authors were able to produce a high - precision chronology model for early domestic horse use in Mongolia.

The new study combined a statistical approach implemented in a unique software modeling programme called IONONEST with data from the Kilpisjärvi Atmospheric and Imaging Receiver Array (KAIRA) radio telescope in Finland, which is capable of making sensitive broadband measurements of the absorption caused to the cosmic radio background by the ionsophere.

Another research project fueled an ongoing debate about which statistical method is better for examining experimental data: Bayesian statistics, which incorporates early intuition, or the classical approach, which only takes a study's collected data into account.

The ability to stretch timescales in optics opens a new path for the exploration and understanding of numerous natural systems for which it remains quite difficult to directly study instabilities, and thereby obtain reliable statistical samples.

Researchers have recently raised alarms about the «file - drawer problem,» in which studies that find no statistical effects are not published (SN: 5/19/12, p. 26).

The study, which included 40 sites from Spain to Russia and employed the most recent sample preparation and statistical techniques to increase dating accuracy, found that Neandertals and modern humans did overlap for 2600 to 5400 years, depending on the exact region they inhabited.

For the new study, Brandt and his colleagues analyzed approximately 15,000 measurements from 18 prior studies of natural gas leaks from across the U.S. using a statistical technique called extreme value theory, which is useful for analyzing infrequent but highly consequential events.

In the study fetal size was expressed as a z score, which is a statistical method of expressing difference from normal; four z scores covers the range from abnormally small to abnormally large.

Some studies have attempted to estimate the statistical relationship between temperature and global sea level seen in the period for which tide gauge records exist (the last 2 - 3 centuries) and then, using geological reconstructions of past temperature changes, extrapolate backward («hindcast») past sea - level changes.

None of the assertions are based on rigorous statistical associations, oceanographic observations or physically based simulations; it is all seat - of - the - pants stuff of a sort that was common in the early days of climate studies, but which is difficult to evaluate when viewed as a scientific hypothesis.

It often comes from essentially pooling together data from a series of small studies, none of which on their own might have had the statistical power to make broad generalizations from their findings.

Appropriate for a comedy about swelling numbers, NBC's latest venture in the multi-camera arena has a statistical basis: Studies like the one released by the White House's Council Of Economic Advisers in 2014, which found that 31 percent of Americans between the ages of 18 and 34 lived with their parents in 2014 — up from 28 percent in 2007.

The report's conclusions about the importance of teacher quality, in particular, have stood the test of time, which is noteworthy, given that today's studies of the impacts of teachers use more - sophisticated statistical methods and employ far better data.

As they progress through the game, students gather information on epidemiology, biology, ecology, history, social studies, and statistical reasoning, which they evaluate to come up with their theory.

The researchers also point out there were 1290 unique school and grade combinations in the study sample — an average of 40 students per combination — which meant it «lacked statistical power to find significant differences between treatment conditions or grade levels».

She should start with Patrick Wolf's «Civics Exam» literature review of 21 studies, which found that the «statistical record suggests that private schooling and school choice often enhance the realization of the civic values that are central to a well - functioning democracy.»

The only studies that consistently find positive effects of resources are those that rely on student performance and school data averaged across all students and schools in a state.These aggregate studies, of which the RAND study is one, rely on limited data and are prone to serious statistical shortcomings, so they have been heavily discounted in the past.

One widely publicized study, which created a statistical test of the validity of value - added measures, [10] found reason for concern.

Our statistical study examines the compelling case of Sweden, the world's best known social democracy, which in 1992 adopted a policy reform that was traditionally supported by libertarians: a nation - wide educational voucher.

The most widespread study of charter schools across the US, which employs statistical techniques...

The most widespread study of charter schools across the US, which employs statistical techniques to conduct such comparisons is from the Center for Research on Educational Outcomes (CREDO).

You should be especially careful about large statistical analyses, which combine data from many different studies or sources, because the data is unlikely to be consistent.

Each student gets a more or less random sample of items, some students will get a bunch of hard ones, some will get easy ones, in fact the test developer doesn't know yet which items will be hard or which ones will be easy, and in fact the expectation is that roughly half the items in the study will not have the right statistical characteristics to survive and be included in the final operational tests anyway.

In further words, OxMetrics refers to the name of a variety of software packages which aims to offer an integrated solution for the econometric study of fiscal econometric data, forecasting, time series study, and statistical study of the panel & cross-section data.

SPSS is statistical software which will help you analyze your thesis data and introduces the information and details of your study in diverse kind of file for analysis.

Statistical interpretation and data analysis will commence when the student decides on the relevance of their chosen information for their study and in which will continue until the defense of the thesis.

The National Association of Realtors (NAR) just released their findings of a study in which they studied «income growth, housing costs and changes in the share of renter and owner - occupied households over the past five years in metropolitan statistical areas throughout the US.»

For statistical reasons which are beyond the scope of this study, we have substituted the ordinal rank for the nominal value for each factor in running our analysis.

I did a statistical analysis of shelters a few months ago which showed that a high live release rate does not correlate with a smaller community size — in fact, if anything, the study showed that a high live release rate is more likely in larger communities.

Inspired by Du Bois» sociological studies on the advancements of Black Americans from the time of Emancipation to 1900, the exhibition will feature a series of response paintings in which the statistical data gathered and made visual by Du Bois has been reduced to abstract color fields and geometric motifs.

I would furthermore like to argue that one always should back up RCM studies with statistical downscaling which at least provides an independent assessment (although it may suffer from different caveats).

Also, as it relates to statistical processes, every study that passes the peer - reviewed test undergoes rigourous examination and analysis to determine whether there are flaws in the study which jeopardise the study's findings.

This study provides a first examination of global disruptions to fire activity using an empirically based statistical framework and a multi-model ensemble of GCM projections, an important step toward assessing fire - related vulnerabilities to humans and the ecosystems upon which they depend.

Much of the core code was originally written by Myles Allen, whose heavily - cited 1999 Allen and Tett optimal fingerprinting paper, here, provided the statistical theory on which Forest 2006 and its predecessor and successor studies were based.

This is the statistical PROCESS involved in EXPERIMENTAL DESIGN, which is equally relevant to the creation of a «model» as it is in design of a seeding for a field plot study.

«Evidence sufficient to disprove either accusation can be defined very precisely: it would consist of the p value supporting the claim of statistical insignificance, the peer - reviewed journal article in which it was presented, and the page number where the study is cited in the IPCC Report.»

One reason is that the statistical inference procedure, which is similar in both studies, systematically underestimates uncertainties.

The demonstrability of the knowledge that is produced by a study is imparted to it by identification of that set of statistical events which is called the statistical «population» of this study.